custom.css

<style>
    /*body {
        background-color: #F5F5F5;
    }*/
    div.cell{
        width: 850px;
        margin-left: 10% !important;
        margin-right: auto;
    }
    h1 {
        font-family: "Open sans",verdana,arial,sans-serif;
    }
    .text_cell_render h1 {
        font-weight: 200;
        font-size: 40pt;
        line-height: 100%;
        color:#447adb;
        margin-bottom: 0em;
        margin-top: 0em;
        display: block;
        white-space: nowrap;
    } 
    h2 {
        font-family: "Open sans",verdana,arial,sans-serif;
        text-indent:1em;
    }
    .text_cell_render h2 {
        font-weight: 200;
        font-size: 20pt;
        font-style: italic;
        line-height: 100%;
        color:#447adb;
        margin-bottom: 1.5em;
        margin-top: 0.5em;
        display: block;
        white-space: nowrap;
    } 
    h3 {
        font-family: "Open sans",verdana,arial,sans-serif;
    }
    .text_cell_render h3 {
        font-weight: 300;
        font-size: 18pt;
        line-height: 100%;
        color:#447adb;
        margin-bottom: 0.5em;
        margin-top: 2em;
        display: block;
        white-space: nowrap;
    }
    h4 {
        font-family: "Open sans",verdana,arial,sans-serif;
    }
    .text_cell_render h4 {
        font-weight: 300;
        font-size: 16pt;
        color:#447adb;
        margin-bottom: 0.5em;
        margin-top: 0.5em;
        display: block;
        white-space: nowrap;
    }
    h5 {
        font-family: "Open sans",verdana,arial,sans-serif;
    }
    .text_cell_render h5 {
        font-weight: 300;
        font-style: normal;
        color: #1d3b84;
        font-size: 16pt;
        margin-bottom: 0em;
        margin-top: 1.5em;
        display: block;
        white-space: nowrap;
    }
    div.text_cell_render{
        font-family: "Open sans",verdana,arial,sans-serif;
        line-height: 135%;
        font-size: 125%;
        width:750px;
        margin-left:auto;
        margin-right:auto;
        text-align:justify;
        text-justify:inter-word;
    }
    div.output_subarea.output_text.output_pyout {
        overflow-x: auto;
        overflow-y: scroll;
        max-height: 300px;
    }
    div.output_subarea.output_stream.output_stdout.output_text {
        overflow-x: auto;
        overflow-y: scroll;
        max-height: 300px;
    }
    code{
      font-size: 78%;
    }
    .rendered_html code{
    background-color: transparent;
    }
    ul{
        /* color:#447adb; */  // colors text too
        margin: 2em;
    }
    ul li{
        padding-left: 0.5em; 
        margin-bottom: 0.5em; 
        margin-top: 0.5em; 
    }
    ul li li{
        padding-left: 0.2em; 
        margin-bottom: 0.2em; 
        margin-top: 0.2em; 
    }
    ol{
        /* color:#447adb; */  // colors text too
        margin: 2em;
    }
    ol li{
        padding-left: 0.5em; 
        margin-bottom: 0.5em; 
        margin-top: 0.5em; 
    }
    /*.prompt{
        display: None;
    } */
    ul li{
        padding-left: 0.5em; 
        margin-bottom: 0.5em; 
        margin-top: 0.2em; 
    }
    a:link{
       font-weight: bold;
       color:#447adb;
    }
    a:visited{
       font-weight: bold;
       color: #1d3b84;
    }
    a:hover{
       font-weight: bold;
       color: #1d3b84;
    }
    a:focus{
       font-weight: bold;
       color:#447adb;
    }
    a:active{
       font-weight: bold;
       color:#447adb;
    }
    .rendered_html :link {
       text-decoration: none; 
    }
    .rendered_html :hover {
       text-decoration: none; 
    }
    .rendered_html :visited {
      text-decoration: none;
    }
    .rendered_html :focus {
      text-decoration: none;
    }
    .rendered_html :active {
      text-decoration: none;
    }
    .warning{
        color: rgb( 240, 20, 20 )
    } 
    hr {
      color: #f3f3f3;
      background-color: #f3f3f3;
      height: 1px;
    }
    blockquote{
      display:block;
      background: #f3f3f3;
      font-family: "Open sans",verdana,arial,sans-serif;
      width:610px;
      padding: 15px 15px 15px 15px;
      text-align:justify;
      text-justify:inter-word;
      }
      blockquote p {
        margin-bottom: 0;
        line-height: 125%;
        font-size: 100%;
      }
   /* element.style {
    } */  
</style>
<script>
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                    inlineMath: [ ["$","$"], ["\\(","\\)"] ],
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